Accession Number : AD0259383

Title :   POSITRON LIFETIMES AGAINST ANNIHILATION IN METALS AND ALKALI HALIDES

Corporate Author : WASHINGTON UNIV ST LOUIS MO

Personal Author(s) : POLLAK,BETTY LOU DILMORE

Report Date : MAR 1961

Pagination or Media Count : 1

Abstract : The positron lifetimes against annihilation in three metals (Cu, Ag, Mg) and ten alkali halide crystals (LiF, NaF, NaCl, NaBr, NaI, KCl, KBr, KI, CsBr, CsI) was determined. The lifetimes obtained are in qualitative agreement with the simple theory discussed in Chapter III. Chapter II serves as a general introduction to the use of the phenomenon of positron-electron annihilation as a tool to explore the electronic structure of solids. Chapter III summarizes the work (experimental and theoretical) which is pertinent to the subject of this thesis. Chapter IV describes the experimental technique and the equipment. Analysis of the data is also treated in this section. A summary of the results of this experiment is given in Capter V. Chapter VI consists of a discussion of the data and comparison with other data as well as the rough theory described in Chapter III for the alkali halides. This section also contains suggestions for further work on the alkali halides. (Author)

Descriptors :   *ANNIHILATION REACTIONS, *POSITRONS, *RADIOACTIVE DECAY, CESIUM, COPPER, CRYSTALS, ELECTRONS, HALOGEN COMPOUNDS, LITHIUM, MAGNESIUM, NUCLEAR MODELS, POTASSIUM, SILVER, SODIUM, SOLID STATE PHYSICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE